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Uptodate Reference Title
Use of flow-volume loops to identify upper airway obstruction
Use of flow-volume loops to identify upper airway obstruction
Flow-volume loops in three settings: normal, COPD, and fixed upper airway obstruction as might occur with a substernal goiter. In the last setting, flow is limited to a roughly equal degree during both inspiration and expiration, with flattening of both limbs of the flow-volume loop. In comparison, the decrease in flow is primarily limited to expiration in COPD.